4MA0 Foundation January 2013 Paper 1 Q13
13 Here is a biased 5-sided spinner.
When the spinner is spun, it can land on red, blue, black, white or green.
The probability that it lands on red, blue, black or white is given in the table.
| Colour | red | blue | black | white | green |
|---|---|---|---|---|---|
| Probability | 0.18 | 0.20 | 0.23 | 0.22 |
George spins the spinner once.
(a) Work out the probability that the spinner lands on green. (2)
Heena spins the spinner 40 times.
(b) Work out an estimate for the number of times the spinner lands on blue. (2)
| Scheme | Marks |
|---|---|
| \(1 - (0.18 + 0.2 + 0.23 + 0.22)\) | M1 |
| 0.17 | A1 |
| (2) |
Notes
M1: \(1 - 0.83\)
| Scheme | Marks |
|---|---|
| \(40 \times 0.2\) | M1 |
| 8 | A1 |
| (2) |
Notes
A1: 8 out of 40 = M1A1 \(\dfrac{8}{40}\) = M1A0